In order to view a file in PDF format, you need Adobe Acrobat Reader.
PDF capture formatting information from a variety of desktop publishing applications, making it possible to send formatted documents and have them appear on the
recipient's monitor or printer as they were intended.

The Microsoft PowerPoint Viewer
allows people who use Microsoft PowerPoint to share their presentations with
users who do not have PowerPoint. This product also allows users who wish to
post full fidelity PowerPoint presentations on the Internet to expand their
online audience to people who might not have PowerPoint. The PowerPoint Viewer
allows users who do not have Microsoft PowerPoint Macintosh® Edition to view and
print PowerPoint presentations, but it does not allow them to edit PowerPoint
presentations.

PowerPoint Viewer for PC

The Microsoft PowerPoint® Viewer allows people who use PowerPoint to share
their presentations with people who do not have PowerPoint installed on their
computers. When you post presentations on the Internet, you can include the
PowerPoint Viewer to expand your online audience to people who might not have
PowerPoint, or to those with different versions. You can view and print
presentations, but you cannot edit them in the PowerPoint Viewer.

Real Player allows people to use streaming technology developed by RealNetworks for transmitting live video over the Internet. RealPlay
also provide audio capabilities.

Windows Media Player

Windows Media Player is the all-in-one media
player that provides the best experience for discovering, playing and taking
your digital entertainment anywhere--on Windows PCs and the widest choice of
portable devices.

WinZip

WinZip brings the convenience of Windows to the use of Zip files and
other compression formats. The optional wizard interface makes zipping
and unzipping easier than ever. WinZip features built-in support for CAB files
and for popular Internet file formats such as TAR, gzip, UUencode, BinHex, and
MIME. ARJ, LZH, and ARC files are supported via external programs. WinZip
interfaces to most virus scanners.

Word Viewer

With the Microsoft Word Viewer, Microsoft Word users can share
documents with those who do not have Word and users without Word can open and
view Word documents. This product also allows users who wish to post
rich-formatted Word documents on the Internet to expand their online audience to
people who might not have Word. This viewer also allows users to view and print
documents created in the Word native file format, even if they do not have Word.
Users are allowed to zoom, outline, or view page layout, headers/footers,
footnotes, and annotations.